<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <script src="jquery-3.6.0.min.js"></script>
</head>
<body>
  <div>Hello jQuery</div>
  <script>
    $('div').hide();    // 隐藏div元素
  </script>
</body>
</html>